it runs , and runs , and runs , got 3 gallons through the first one , and i just finished the 15 th tank on the second one in my losi truggy , these things have tons of power , is really good on plugs only had to change it once in 3 gal, ( i check it every race/practice day) take the break in slow and make sure to keep the heat up on break in / the first gallon, talked to a few rossi sponsored drivers they say to keep it warm with a head cover as your going to be running it rich for at min the first half gal over 190 to properly expand the piston, all in all great power house, i will be sticking with them